chore: fix unnecessary and not available pkgs, cleaning

modules/nixos/desktops/plasma.nix

@@ -1,7 +1,7 @@
-{ lib, ... }: {
+{ lib, pkgs, user, ... }: {
   imports = [ ./base.nix ];
 
-  # KDE Plasma 6
+  # System-level: KDE Plasma 6
   services.desktopManager.plasma6.enable = lib.mkDefault true;
 
   # SDDM display manager
@@ -10,6 +10,33 @@
     wayland.enable = lib.mkDefault true;
   };
 
-  # KDE apps are managed by Plasma
-  # Add extra packages in your host config if needed
+  # System packages: KDE applications
+  environment.systemPackages = with pkgs;
+    [
+      # KDE applications (uncomment as needed)
+      # kdePackages.kate          # Text editor
+      # kdePackages.dolphin       # File manager
+      # kdePackages.konsole       # Terminal
+      # kdePackages.okular        # Document viewer
+      # kdePackages.gwenview      # Image viewer
+      # kdePackages.spectacle     # Screenshot tool
+    ];
+
+  # User-level: KDE Plasma settings (optional)
+  home-manager.users.${user} = {
+    # KDE Plasma configuration via Home Manager (optional)
+    # programs.plasma = {
+    #   enable = true;
+    #   workspace = {
+    #     theme = "breeze-dark";
+    #     colorScheme = "BreezeDark";
+    #   };
+    # };
+
+    # User packages for KDE environment
+    home.packages = with pkgs;
+      [
+        # Add user-specific apps here
+      ];
+  };
 }